| http://www.w3.org/ns/prov#value | - A hydroxy-lower-alkyl thioether, -sulphoxide or -sulphone can be converted by replacing the hydroxy group by a halogen atom (e.g. using a halogenating agent such as thionyl chloride) into the corresponding halo-lower-alkyl derivative [Z represents --S(O)m R, wherein R represents halo-lower-alkyl and m is as defined previously] from which there can be obtained by treatment with a base (e.g. an amin
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